Book
Maths Puzzle
Percentage
A nurse must add a 5% solution to 750 ml of a 30% to produce a 20% solution. How much of the 5% solution must be added?
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Book Other Question
5q^2+12q-9 divided by 5q^2-22q-15 ;then multiply by 20q^2=12q divided by 9-q^2
I am at a loss to factor this in order to come to a solution. Can you help?
A wild birdseed mix is made by combining 100lb. of millet seed costing $0.60 per lb. with sunflower seeds costing $1.10 per pound. How many pounds of sunflower seeds are needed to make a mixture that costs $0.70 per lb?